/Engine/Source/Runtime/NavigationSystem/Public/NavigationDirtyAreasController.h
Add a dirty area to the queue based on the provided bounds and flags. Bounds must be valid and non empty otherwise the request will be ignored and a warning reported. Accumulation must be allowed and flags valid otherwise the add is ignored.
void AddArea ( const FBox & NewArea, const int32 Flags, const [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< [UObject](API\Runtime\CoreUObject\UObject\UObject) *()> & ObjectProviderFunc, const [FNavigationDirtyElement](API\Runtime\Engine\AI\Navigation\FNavigationDirtyElement) * DirtyElement, const [FName](API\Runtime\Core\UObject\FName) & DebugReason )